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Lunar precursor effects in the Terrestrial magnetosphere and solar wind

Lunar precursor effects in the Terrestrial magnetosphere and solar wind. Jasper S. Halekas Space Sciences Laboratory University of California, Berkeley. The Lunar Space Plasma Environment: Pre-ARTEMIS. Precursor Effects in the Terrestrial Magnetosphere. All Electrons. Upgoing e - (0-15°).

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Lunar precursor effects in the Terrestrial magnetosphere and solar wind

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  1. Lunar precursor effects in the Terrestrial magnetosphere and solar wind Jasper S. Halekas Space Sciences Laboratory University of California, Berkeley

  2. The Lunar Space Plasma Environment: Pre-ARTEMIS

  3. Precursor Effects in the Terrestrial Magnetosphere All Electrons Upgoinge- (0-15°) Downgoinge- (165-180°) fp fce EFI FFT EFI Background fp SCM FFT fce B Wavelets Spin Tone fci B Field

  4. Free Energy Sources: Reflected Electrons in Magnetosphere E = - U Δ Converging Magnetic Field Lines above Crustal Magnetic Fields Loss Cone Beam Plasma Electrons Follow Magnetic Field Lines and Reflect from E & B Beam + Loss Cone: Produced By Combined Magnetic & Electrostatic Effects Near Surface Secondary Electrons Accelerated Upward Downward Electric Field

  5. Polarization Properties B0 Waves propagating anti-parallel to field Narrowband EXB Coherent E B Right-Handed Parallel-Propagating • Wave properties all consistent with parallel-propagating whistlers coming down • the magnetic field line towards the Moon

  6. Instability Conditions Streaming instabilities where df/dv|| positive EFI SCW Whistlers correlate with edges of loss cone: i.e. df/dvperp positive Reduced Distribution Function Whistler Mode: ω/k, (ωce-ω)/k

  7. Ions in the Mix? • Waves near fci modulate both the electron beam and the whistlers • Possible sources: Electron beam, shadowed ion distributions, bi-ion streaming ICWs? Electron Beam Modulated Loss Cone Modulated Whistlers Modulated FGM Wavelets Proton & Helium Cyclotron Frequencies

  8. Precursor Effects in the Solar Wind Ions Upgoinge- (0-15°) Downgoinge- (165-180°) EFI FFT SCM FFT B Wavelets B Field SZA of Surface Connection

  9. Free Energy Sources: Reflected Electrons in Solar Wind Solar Wind Electron Trajectory Magnetic Field Convection Electric Field Generalized obstacle with magnetic field gradient and/or electrostatic potential gradient Fitzenreiter et al., 1990 Gives you “Ears” in Solar Wind Frame Adiabatic Reflection in dHT Frame

  10. Whistler Cyclotron Resonance Conditions EFI SCW Reduced Distribution Function (ωce-ω)/k: ω, k on whistler branch

  11. Ion Observations P2 Ions Foreshock Ions P1 Ions Reflected Protons P1 Reduced Dist. Funct. P1 Power Spectrum Parallel-Propagating P1 Propagation RH, LH P1 Ellipticity

  12. Free Energy Sources: Reflection From Crustal Magnetic Fields Reflected Proton Fluxes Lue et al., 2010 Reflected Protons Follow Pickup Ion Trajectories Distribution Near Cycloid “Cusp” IMF Solar Wind SW Gyrating Protons

  13. Pickup Ion Trajectories Reconstructed Ion Trajectories Connected Unconnected Surface Crustal Magnetic Field

  14. Ion Reflection Source Map 26 Event Periods, June 29 – August 31

  15. Lunar Precursor Effects

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